Attachment-plug



G. W. GOODRIDGE.

ATTACHMENT PLUG.

APPLICATION FILED DEC.31, 1917.

Patented May 18, 1920. v

Inventor:

y GILBERT W Gooumzrzn:

UNITED STATES PATENT OFFICE.

GILBERT W. GOODRIDGE, OF BRIDGEPORT, CONNECTICUT, ASSIG-NOR TO THE BRYANT ELECTRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CON- N ECTICUT.

ATTACHMENT-PLUG.

Application filed. December 31, 1917.

To alt whom it may concern.

Be it known that I, GILBERT IV. GOUD- moon, a citizen of the United States of America, and residing in Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Attachment ;Ilugs,. of which the following is a specification.

My invention relates to attachment plugs, and the object of my invention is to provide a simple and rugged electrical device of this character which is not only economical to manufacture, but also easy to wire and eflicient in service.

Referring to the accompanying drawings, Figure 1 is a plan view of an attachment plug in which my invention is embodied in' one form; r

Fig. 2 is a vertical section therethrough on the line 2.2, Fig. 1;

Fig. 3 is a cross section on the line Fig. 2;

Fig. 4 is an inverted plan of the cap member of the plug;

Fig. 5 is a vertical section on the line 5-5, Fig. 1; and

Fig. 6 is a perspective of one of the securing screws for attaching the cap to the body of the plug.

In, the'form here shown, the plug comprises a body member 10 and a cap member 11, both of insulating material and preferably of molded insulation. The cap member isrecessed on its inner face at 12to afford a chamber of generally oval form to accommodate the strain relief knot 13 tied in the ends of the two wires which are combined in the insulating casing of the wire cable let. This cable is generally oval in transverse section and enters the chamber 12 through a passage 15 of similar shape, the longer axis of which substantially corresponds to the longer axis of the chamber 12. A marginal flange 16 on the inner face of the cap fits over the cap end of the body 10 of the plug and forms a snug joint therewith. In order properly to position the cap upon the body, especially with relation to the oval recess 12 and the binding terminals hereinafter to be described, a lug 17 is provided which proj ects radially inward from the flange 16 and takes into a corresponding marginal recess 18 in the cap end of the plug body 10. Securing screws 19 and 20 pass through the cap 11 on opposite sides of the chamber 12 Specification of Letters Patent.

Patented May 18, 1920.

Serial No. 209,681.

still engage the threads of the screws and prevent the latter from falling out of the holes 26 and 27 through which they pass. In order to prevent the bushings from turning with the screws 19 and 20 when the latter are set down hard, the bushings may be of non-circular shape, or their heads may be provided with serrations, as M28.

The body 10 of the plug is longitudinally perforated at 29 and 30 to receive the binding screws 31 and 32 by which connection is established between the cable wires and the plug terminals' 33 and 3 1. The sleeves 35 and 36 of the terminals are internally tapped to receive the threadedends of the screws 31 and 32:and are similarly provided with "a milled flange 37 acljacent the projecting ends of the terminals to hold the same against rotation when the binding screws 31 and 32 are set up. In the cap end of the body member 10, shallow wells 38 and 39 are provided to form seats fer the heads 40 and 41 of the binding screws 31 and 32, but are extended to oneside of the latter to accommodate the ends of the connecting wires. The extensions of the wells 38and 39 project in opposite directions with relation to the axial plane of the binding screws, thus insuring the separation of the bared ends of the connecting wires and preventing any danger of short circuit. It will be noted, furthermore, that the heads 40 and 41 of the binding screws are of substantially the same diameter as the wells 38 and 39, and thus cooperminals 33 and 34 in engagement with the corresponding terminals of the receptacle.

It will be recognized that the plug is of extremely simple and economical construction and at the same time presents a very rugged and serviceable fitting adapted to withstand rough handling in use without injury. Various modifications in details of construction will readily occur to those skilled in the art which do not depart from what I claim as my invention.

I claim as my invention:

1. An attachment plug having cap and body members and screw means for uniting the same, wiring wells formed in the cap end of the body member, plug contacts fixed to the body member and exposed at the entering end thereof, binding screws having heads seated in said Wells, and threaded shanks taking into said contacts to establish electrical connection between the wires clamped beneath the heads of the screws in the wiring'wells and the plug contacts.

2. An attachment plug'having cap and body members and means for uniting the same, wire terminals on opposite. sides of the axis of the body member at the cap end thereof, a strain relief knot chamber in the cap member and means piercing the cap on opposite sides of its axis at the point of short diameter of said chamber for. securing the cap to the body with :the long axis of the chamber substantially alined with the plane of the wire. terminals on'the body member.

3. An attachment plug having independent cap and body members, said body having at its entering end plug contacts and associated tapped bushings integral therewith molded into the body, bindingscrews tak-' ing into said tapped bushings, the heads of said binding screws being accommodated in recesses formed in the cap end of the body, insulating means projecting from the sides of the body member by which the plug may be connected to a cooperating receptacle, insulating bushings molded into the cap end of the body member and screws piercing the cap member and taking into said bushings to hold the parts assembled. v

4. An attachment plug comprising'independent'cap and body members,"the body member having contacts at its entering end,

binding screws extending parallel to the axis of the plug and taking into said contacts to establish electrical connections therewith, tapped bushings molded into. the body piece on a plane substantially at right angles to the plane 01"; the plug contacts, in combination with the screws passing through said cap and taking into said tapped bushings to cap and taking intosaid tapped bushings to unite said cap and body members, together with stud means projecting frOmthesides oi the body member substantially in the plane'of the tapped bushings and serving as means by which the plug may be connected to a cooperating receptacle. I

- 6. In an attachment plug, a body of insulating material having at its entering end a pair of contacts, binding screws extending in a direction substantially parallel to the axis of the plug and taking into the contact from the cap end of the plug, together with a pin passing transversely through the body of the plug between the contact and projecting from the opposite sides of the body to" form studs, by which the plug may be connected to a cooperating receptacle. V

In testimony whereof I have signed my name tothis specification.

' GILBERT W. GOODRIDGE.

tion with the screws passing throughv said 5 

